var __defaultFired = false;
function WebForm_FireDefaultButton(event, target)
{
    var element = event.target || event.srcElement;
    if (!__defaultFired && event.keyCode == 13 && !(element && (element.tagName.toLowerCase() == "textarea")))
    {
        var defaultButton;

        if (__nonMSDOMBrowser)
            defaultButton = document.getElementById(target);
        else
            defaultButton = document.all[target];

        if (defaultButton && typeof(defaultButton.click) != "undefined")
        {
            defaultButton.click();
            event.cancelBubble = true;
            if (event.stopPropagation)
                event.stopPropagation();
            return false;
        }
    }
    return true;
}